sipdroid,nettalk,nettalk sip configuration,nettalk sip settings,VOIP,RTP,RTCP,Linux,Android,SSCA,why Android,how to downgrade android,android google reader,google services on android,vitamio api on android,android what is an intent,must have android apps,upgrade android,what is android,sip trunking how it works,sip commentluv leave a reply url -comments are closed,how to connect vidyogateway to sip endpoint,sip trunking what is bri and pri how popular is sip for videoconferencing, sip android

Thursday, 27 September 2012

A session border controller (SBC) is a device regularly deployed in Voice over Internet Protocol (VoIP) networks to exert control over the signaling
and usually also the media streams involved in setting up, conducting,
and tearing down telephone calls or other interactive media
communications.
Early deployments of SBCs were focused on the borders between two
service provider networks in a peering environment. This role has now
expanded to include significant deployments between a service provider's
access network and a backbone network to provide service to residential
and/or enterprise customers.[1]
The term "session" refers to a communication between two parties – in
the context of telephony, this would be a call. Each call consists of
one or more call signaling message exchanges that control the call, and
one or more call media streams which carry the call's audio, video, or
other data along with information of call statistics and quality.
Together, these streams make up a session. It is the job of a session
border controller to exert influence over the data flows of sessions.
The term "border" refers to a point of demarcation between one part
of a network and another. As a simple example, at the edge of a
corporate network, a firewall demarcates the local network (inside the
corporation) from the rest of the Internet (outside the corporation). A
more complex example is that of a large corporation where different
departments have security needs for each location and perhaps for each
kind of data. In this case, filtering routers or other network elements
are used to control the flow of data streams. It is the job of a session
border controller to assist policy administrators in managing the flow
of session data across these borders.
The term "controller" refers to the influence that session border
controllers have on the data streams that comprise sessions, as they
traverse borders between one part of a network and another.
Additionally, session border controllers often provide measurement,
access control, and data conversion facilities for the calls they
control.